International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 11 | Nov 2025
p-ISSN: 2395-0072
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UV Ray Detection Using Comparator 1Tanishka Dhumal, 2Swastik Mahamuni, 3Yash Pawar, 4Sujal Sarkale, 5Prof.Rohan Shinde 1.2,3,4 UG scholar, 5Assistant Professor, Electronics & Communication Engineering Department,
School of Engineering & Sciences, MIT Art, Design & Technology University, Pune, India ---------------------------------------------------------------------***--------------------------------------------------------------------and contributing significantly to the development Abstract - Ultraviolet (UV) radiation, an invisible portion of of skin cancer. UVC (100–280 nm): Exhibits the highest energy among UV bands; however, it is effectively filtered by the Earth’s ozone layer and does not typically reach the surface.
the solar electromagnetic spectrum, offers well-known benefits such as vitamin D synthesis and surface disinfection. However, excessive exposure is strongly linked to skin damage, premature aging, ocular disorders, and increased risk of skin cancer. This paper presents the design and implementation of a low-cost, analog-only UV detection circuit that requires no microcontroller or programming.
Although minimal UV exposure is beneficial, particularly for endogenous vitamin D synthesis, excessive exposure is strongly associated with various adverse biological effects. Consequently, reliable UV detection is essential in environmental monitoring, public health, and material degradation assessment.
The proposed system employs an inexpensive UV sensor (e.g., GUVA-S12SD or equivalent UV-sensitive photodiode) whose output voltage varies proportionally with incident UV intensity. This voltage is continuously compared against an adjustable reference level, set via a potentiometer, using an LM324 quad operational amplifier configured as a comparator. When the sensed UV level exceeds the preset threshold, the circuit activates a visual (LED) and/or audible (buzzer) alarm to alert the user in real time.
1.2 Health and Environmental Implications: UV radiation impacts living organisms at the molecular and cellular scales. Prolonged or intense exposure can induce DNA damage, promote mutagenesis, impair immune function, and contribute to various ophthalmic disorders. Additionally, continuous UV exposure accelerates photodegradation in polymers, coatings, and other materials, thereby reducing their functional lifespan. Accurate quantification of UV levels facilitates the development of protective strategies, including improved sunscreen formulations, UV-blocking materials, and environmental safety measures.
The resulting detector is simple, robust, highly power-efficient, and constructed entirely from basic analog components. Its minimal cost and ease of assembly make it particularly suitable for educational laboratories, environmental monitoring stations, fieldwork, and personal UV-exposure warning devices. This work demonstrates that effective, realtime UV monitoring can be achieved reliably without resorting to digital processors, offering an accessible and economical solution for a wide range of practical applications.
1.3 Importance of UV Detection: Monitoring UV radiation is vital for safeguarding public health, particularly in regions experiencing ozone depletion. UV detection technologies can be incorporated into smart wearables, outdoor protection systems, and automated shading mechanisms. The development of a compact and cost-effective analog UV detection circuit serves as a practical alternative to more expensive digital sensor systems.
Keywords: UV Sensor, Comparator IC, LM324, Analog Circuit, UV Intensity, Low-Cost Design, Environmental Monitoring, LED Indicator
1.INTRODUCTION 1.1. Background of UV Radiation: Ultraviolet (UV) radiation constitutes a segment of the electromagnetic spectrum situated between visible light and X-rays, with wavelengths spanning from 100 to 400 nanometers (nm). It is conventionally categorized into three distinct bands: UVA (320–400 nm): Characterized by relatively low photon energy but high abundance, enabling deeper penetration into biological tissues. UVB (280–320 nm): Possesses higher energy levels capable of causing erythema (sunburn)
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1.4 Paper Overview: This paper focuses on the design, implementation, and evaluation of a UV radiation detection system utilizing a comparator-based analog circuit. The specific objectives include: 1. Implementing a comparator circuit using the LM324 operational amplifier for UV intensity detection. 2. Providing a visual alert (via LED) when the detected UV level exceeds a predefined threshold.
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